GasGas Riders Club Forum  

Go Back   GasGas Riders Club Forum > GasGas Enduro Technical Forums > Enduro Engine - 2 stroke

Enduro Engine - 2 stroke Cylinder, Piston, Tranny, Bearings, Clutch, Pipes & Silencers, etc.


Reply
 
Thread Tools Display Modes
  #1  
Old 05-13-2022, 07:16 PM
IdahoUSA207 IdahoUSA207 is offline
Member
 
Join Date: Dec 2021
Location: Emmett, Idaho
Posts: 2
Default 250 to 300 cylinder swap (search for torque)

Has anyway swapped their 250 to a 300 with the cylinder head kit?
This is my first 250 2-stroke Iv always been a 4 stroke or 300xc KTM guy..
I really like my 2019 GG 250xc but it is in my opinion a zingy 250, like a yz 125.. (ok maybe not that zingy &#128518 but you get the idea.
I like bottom end torque, I ride down low in the meat.
Iv looked at the 300cc cylinder head swaps on eBay.. just wonder if it will be worth the money? technically speaking it should be really? but I also have never rode a GG300 so are they tractor pull, grunt workers like the KTM 3honey?
Also, would swapping out the FMF fatty for a Gnarly make much of a difference? (Pre-cylinder swap that is) it would be nice to just swap out pipes in order to gain what I want but I just can see it making ?that big? of a difference alone.
And yes, most people will suggest ?do the gnarly pipe first and if it?s not enough so the cylinder swap??. Yes, thank you.. that?s great advice.
I?m wonder more if anyone has already experimented and could share their thoughts on rather the expensive cylinder swap is money well spent or is the slightly cheaper (not by much these days) gnarly pipe a good change to gain low end?


__________________
2019 GasGas XC250
Reply With Quote


  #2  
Old 05-14-2022, 09:13 AM
gasgasman's Avatar
gasgasman gasgasman is offline
Super Moderator
 
Join Date: Jul 2006
Location: Pearland Texas
Posts: 4,491
Default

You can adjust the power valve for more low end power.
I have tried these pipes on my '18 250.
The Gnarly will give you more low to mid power.
The Fatty; more mid to top end power.
Pro Circuit. more mid to top end power and increased over rev.
Can't recommend the Pro Circuit. as the silencer inlet has to be expanded to slide onto the PC pipe.
Reply With Quote
  #3  
Old 05-15-2022, 07:38 PM
Stoby's Avatar
Stoby Stoby is offline
Bronze Level Site Supporter
 
Join Date: Jun 2009
Location: Franklin,Mass.
Posts: 554
Default Easy peezy

Turned 2 250s into 300s. If you like 300s the gasser will make you smile. If you like your bike to sing 250 if you want grunt 300. Gnarly pipe more torque and beefier build quality.
Good luck
Reply With Quote
  #4  
Old 05-16-2022, 02:19 AM
(F5)'s Avatar
(F5) (F5) is online now
Gold Level Site Supporter
 
Join Date: Jul 2006
Location: Wellington New Zealand
Posts: 1,811
Default

Trying a decent needle first will change the power delivery
__________________
'07 EC300 GG
14 TXT250 GG
07 Beta Rev3
496 CPI Cheetah RZ/RGV hybrid
765 Street Triple RS
'21 XTrainer
Stinger T125 Suzuki
Reply With Quote
  #5  
Old 05-16-2022, 01:45 PM
Zman's Avatar
Zman Zman is offline
Platinum Level Site Supporter
 
Join Date: Apr 2010
Location: Burbs of Chicago
Posts: 1,703
Default

One more option is to convert your 250 into a 265 with a Big Bore kit. I built a 265 last summer and while it does not have the bottom end of a 300, it does make a nice increase over a 250 with better low end and mid-range power combined with the ability to scream up top.
Reply With Quote
  #6  
Old 05-17-2022, 02:03 PM
gasser's Avatar
gasser gasser is offline
Senior Member
 
Join Date: Nov 2006
Location: Cookeville, TN
Posts: 1,457
Default

Quote:
Originally Posted by Zman View Post
One more option is to convert your 250 into a 265 with a Big Bore kit. I built a 265 last summer and while it does not have the bottom end of a 300, it does make a nice increase over a 250 with better low end and mid-range power combined with the ability to scream up top.
who makes the 265 kit?
Reply With Quote
  #7  
Old 05-17-2022, 10:41 PM
Zman's Avatar
Zman Zman is offline
Platinum Level Site Supporter
 
Join Date: Apr 2010
Location: Burbs of Chicago
Posts: 1,703
Default

You need to send off your 250 cylinder and head. There are multiple previous posts about the big bore kits and who provides them.
Reply With Quote
  #8  
Old 05-18-2022, 01:29 PM
Jacob 'Berg Jacob 'Berg is offline
Senior Member
 
Join Date: Mar 2014
Location: Scottsdale, AZ
Posts: 554
Default

I have heard that Tom Morgan does excellent work.

https://www.morganracingengines.com/tmrservices.html
Reply With Quote
  #9  
Old 05-18-2022, 10:11 PM
SS109's Avatar
SS109 SS109 is online now
Senior Member
 
Join Date: Jan 2011
Location: Tucson, AZ
Posts: 665
Default

Quote:
Originally Posted by Zman View Post
One more option is to convert your 250 into a 265 with a Big Bore kit. I built a 265 last summer and while it does not have the bottom end of a 300, it does make a nice increase over a 250 with better low end and mid-range power combined with the ability to scream up top.
The 265 big bore is awesome! I have built two but neither was a GG (Honda CR250 and a KX250) but have been considering it for my '11 GG EC250R. The 265 turned those MX bikes into great woods bikes with the additional low end they picked up yet they absolutely screamed when you opened them up. I used Millennium both times since they clean, port, squish, clearance, replate the cylinder, and reassemble the powervalves.
__________________
Trail Riders of Southern AZ club
WildAzzRacing Youtube channel
AZ State Parks OHV Ambassador
'11 EC250R
'98 KDX220
Reply With Quote
  #10  
Old 05-19-2022, 06:31 PM
frankinberg's Avatar
frankinberg frankinberg is offline
Platinum Level Site Supporter
 
Join Date: Jul 2012
Location: Brighton colorado
Posts: 262
Default

I have built 2 1 was stroked to a 265 and 1 was bored feel about the same going to stroke my 325 I think it will be a 340 will see
Reply With Quote
Reply



Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
2019 300/250 cylinder swap IdahoUSA207 Enduro Engine - 2 stroke 1 12-23-2021 11:48 AM
Trick to torque recessed cylinder nuts d2w Enduro Engine - 2 stroke 9 02-13-2014 10:13 AM
Setting new cylinder studs - torque motogroove Enduro Engine - 2 stroke 3 07-20-2011 02:04 AM
Torque cylinder head EC 300 2009 Klausen Enduro Engine - 2 stroke 9 10-03-2010 10:49 AM
Cylinder Bolt Torque? eff Enduro Engine - 2 stroke 12 03-30-2008 08:44 AM




All times are GMT -5. The time now is 03:59 AM.


Powered by vBulletin® Version 3.8.6
Copyright ©2000 - 2022, Jelsoft Enterprises Ltd.
Copyright 2009 - GasGasRider.org